"We believe this HERO helped save several lives including an infant," the department wrote on Facebook.

"His actions at Wal-Mart were critical and lifesaving, he needs to be identified and interviewed by investigators."

Security cameras caught the man exiting the Walmart. A timestamp reads "11:05:37," which El Paso Police know is off from the time in which the mass shooting occurred.

"Yes the time stamp is off, if that's what is important here to some," the department wrote in a Facebook comment. "We need help identifying this man that's the important thing not the Central time zone stamp."

We believe this HERO helped save several lives including an infant. ... Crimes Against Persons is requesting the community's help in identifying the person in the picture. His actions at Wal-Mart were critical and lifesaving, he needs to be identified and interviewed by investigators. Call (915) 212-4040

Police ask anyone who knows the identity of the man to call (915) 212-4040.

On August 3, a man walked into a packed El Paso Walmart and opened fire, killing 22 and injuring dozens more. Less than two weeks following the horrific shooting, half of those injured remain hospitalized.

The suspected shooter is charged with capital murder and being held without bond while investigators continue to process the carnage at the crime scene.

Police have identified the suspect as a 21-year-old Dallas-area resident who told investigators he was targeting Mexicans.